package com.atguigu.netty.dubborpc.nettty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @author: 叶子
 * @date: 2022/04/07 21:18
 **/
public class NettyClient {
    //创建线程池
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
    private static NettyClientHandler client;
    private int count = 0;

    //编写方法使用代理模式，获取代理对象
    public Object getBean(final Class<?> serviceClass, final String providerName) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class<?>[]{serviceClass}, (proxy, method, args) -> {
                    //客户端每调用一次hello，就会进入到该代码
                    System.out.println("第" + (++count) + "次" + "进入proxy,method,args 这段代码");
                    if (client == null) {
                        initClient();
                    }
                    //设置要发给服务器端的信息
                    //providerName 协议头 args[0]就是客户端调用api hello(??)，参数
                    client.setParam(providerName + args[0]);
                    return executor.submit(client).get();
                });

    }

    //初始化客户端
    private static void initClient() {
        client = new NettyClientHandler();
        //创建EventLoopGroup
        NioEventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        pipeline.addLast(new StringEncoder());
                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(client);
                    }
                });
        try {
            bootstrap.connect("127.0.0.1", 7000).sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}